Low-metal alarm



Na'v. 22, 1927. A

v. A. BOKE- R LOW METAL ALARM Filed May @5. 1925 V/raS/ZBOKER .Br f//S TOFNEYS Patented Nov. 22, 1927.

UNITED STATES PATENT OFFICE.

'virus A. BOXER, or MINNEA-roLrs` MINNESOTA, AssIGNon To BOY n. HOLLAND, or MINNEAPOLIS, MINNESOTA. i

LOW-METAL ALARM.

.Application led May25,`1925. Serial No. 32,725. f

This invention relates to a type casting machine,` and particularly to'an alarm device for such a machine adapted to warn the operator when the supply of molten metal carried in the metal pot of said machine becomes too low. Itis lvery desirable in such machines to haveD a good supply vof molten metal in the metal pot. If the supply of metal getsl low imperfect slugs are apt tov be cast and the metal is apt to beV over heated.

It is an object of this invention, therefore, to provide a simple and efficient alarm device for warning the operator when the metal in the metal pot is at too low a point. t is a further object of the invention to provide an alarm device in the .movable metal pot of a type casting machine which is operated by -the customary movement of the pot.

1t is more specifically an object of the invention to provide an alarmV device for the movable metal pot of a typeca'sting machine comprising' a' member adapted to be disposed in the molten metal in said pot having a lever connected thereto andprojecting at one side of a casing carrying said pot, said lever being adapted to be moved to a certain position when the supply of lmetal is low, in which position it will be brought into operative relation with an alarm device and will operate the same upon the movement of said metal pot.

These and other objects and advantages of the invention will be fully set forth in the following description made yin connectiony extending from bracket r15.

with the accompanying drawings in which like reference characters refer to thefsame parts throughout the different views, and in which, Y

Fig. 1 is a view in side elevation of a portion of a type casting machine;

Fig. 2 is a `view in side elevation of a portion of the machine shown in Fig. 1, a part of said portion being shown in vertical section; and

Fig. 3 is a horizontal section taken on the line 3 3 of Fig. 2, as indicated by the arrows, Figs. 2 and 3 being shown on an enlarged scale.

, suitable nut.

Referring to the drawings, aV portion ofa type casting machine is shown comprising a stationary frame 1. A shaft 5 is mounted in 4the stationary frame and forms a cam shaft carrying thereon a cam 6. Another shaft 7 is mounted inthe stationary part of the frame and forms a pivot shaft for a portion 8 of the machine. The portion 8 carries the meta-l from which the type vare cast and in the regular operation ofthe machine, the

portion 8 including the casing 9, is moved at intervals about the pivot shaft 7 This movementis affected by cam 6 engaging a ,cam roller 10 carried on an arm llpivoted kbetween lugs 8a extending from the portion 8. The portion 8 also has a downwardly extending lug 8b carrying a pivot stud or shaft 12 about which is vpivoted a bolt 13 vhaving a threaded end extending through an apertured boss on the arm 11 and provided at the outer side of said arm with a A compression spring 1liV is disposed between arms 11 and the head of the bolt 1 and it will be seen that this spring can be adjusted as vto tension by adjusting the nut on bolt 13.

Ak bracket 15 is provided on the stationary part of the lfra-meet having secured to its upper end an alarm bell 16. .Apin 17 is L'secured in the side of bracket 15 and-a `clapper arm 18 has spaced lugs 18ZL journaled on said pivot, said clapper'larm normally being held against astop; lug 15a formed on bracket 15 18 at one end andat the other to a lug V15b The clapper arm 18 is somevvhatresilient, especially at its upper end, and Yis provided with a clapper 18b adapted to strike the inside of the bell 16. Y

,The casing 9 carries therein a metalpot 20, said casing 9`having an upper flange 9a thereon to which the lid 9b is hinged. The pot 20- is adapted to contain molten metal 21 anda weight member 22 is provided made of steel or vsome other metal adapted to resist the temperature of the 'molten metal. Said Weight 22 is carried at the lower end of a'rod 23 pivotally connected at its Aupper by a tensile'coiled spring 19 secured to arm l end to the inner end of a' levell arm 24, said lever arm being bifurcated at its intermediate port-ion and pivoted to a lug 20EL upstanding from the top portion of pot 20, said pot being formed with an inwardly extending flange which is provided with an aperture through which passes the rod 23. A lever 24 has a web extending between its bifurcated end in which is disposed a headed screw 25 provided with a` suitable j amb nut, which screw isI adapted at times to contact the top of lever 24. The lever 24 eX- tends t-hrough an aperture 9c in the side ofv casing section 9a and, as shown in Figs. 2 and 3, is of liat formation, being offset laterally and having a downwardly extending portion at its outer end cutaway to form a shoulder 24a. The outer end of lever 24 is arranged tobe in vertical alinement with the lower end of clapper arm 18 and normally, as shown in Fig. 2, the outer end of lever 24 is in engagement with the lower side of aperture 9.

In operation, the portion 8 of the machine carrying casing 9 oscillated at intervals about shaft 7 by the cam 6, in the slug casting operation. rlhe member 22 is submerged in the metal 21 and said metal tends to force member 22 upward therein .as the specific gravity of member' 22 is less than that of metal 21. When there is sufficient metal in pot 2O to cover the member 22 and the same is forced upwardly, as stated, the lever 24 will be held in such. position that its outer end will not contact the clapper arm 18 when the parts 8 and 9 are oscillated by cam 6 in the slug` casting operation. If the supply of metal in the pot 2O becomes low so that the weight 22 is allowed to drop, said weight would raise the outer end of lever 24. As the portions 8 and 9 swing back to their normal position after being operated by cam 6, the shoulder portion 24n on lever 24 will engage the lower end of the clapper arm 18 and said clapper arm will be swung against the tension of spring 19, clapper 181? being moved away fromthe bell 16. The shoulder portion 24EL will slip over the lower end of the clapper bar 18 so that said bar will suddenly be released. Spring 19 will then quickly pull said clapper bar against stop 151 and clapper 18br will strike the bell a sharp blow. This will sound the bell and warn the operator that the metal in the pot is too low. The screw 25 can be adjusted so that the outer end of lever 24 cannot be raised too high .by the weight 22. Y

From theV above description it is seen that applicant has provided a very simple and efficient low metal alarm for the molten metal in the type casting machine. The device has a high degree of utility, and the f parts thereof are simple and inexpensive and can readily be placed on the standard type casting machine. The kdevice has been amply demonstrated in actual practice and found to be very successful and ehficient.

It will, of course, be understood that various changes may be made in the form, de-

tails, arrangement and proportions of the parts without departing from the scope of applicants invention, which, 4generally stated, consists in a device capable of carrying out the objects above set forth, suchas shown and described and' defined'in the appended claims.

lVhat is claimed is:

1. A type casting machine having in combination, a movable metal pot adapted to contain molten metal, a weight disposed in said pot' and adapted to be-y submerged in said metal, means movable to operative. position by said weight when the supplyI of metal becomes low, and an alarm device having a member adapted to be engaged and moved by said means in the movement of said pot when saidmeans is in said operative position.

2. A type casting machine having in combination, a movable part carrying aV metal pot adapted to contain molten metal, said pot havingV a substantially horizontal interior iange, a lug on said flange, a lever having a channel shaped portion embracing and pivotecl to said lug about a horizontal axis,

having a free end projecting from said' pot, an adjustable screw carried by saidv lever adapted to engage said lug to limit the downward movement of the inner endV of saidv lever, a rod pivotally connected to said inner end, a weight carried at the lower end of said rod adapted to beA submerged in the metal in said pot, means for limiting the downward movement of the outer end of said lever,` and an alarm device having va spring controlled operating arm adapted to be engaged andA moved by the free end of said lever in the movement of said part and pot when said lever arm is curved upwardly by. the descent of said weight and when the metal is low in said pot 3. A type casting machine having: in combination, a movable part carrying a metal potV adapted .to contain molten metal, a weight disposed in said pot adapted to be submerged in said metal andnormally urged upward by said metal, a lever connected to said member having an armv projecting from said pot, an adjustable stop member carried by said lever, a member in said pot against which said stop member contacts when said weight descends, said weight being adapted to move said lever arm to operative position when the supply of metal in said pot becomes low and an alarm device having a spring pressed operating arm adapted to be engaged` and moved by said lever armv in the movement of said part and pot when said lever arm is in operative position.

ll. A type casting machine having in com- 111g a member 'adapted to be engaged by and y bnation, a movable metal pot adapted to moved by thevouter end of said lever when 10 contain molten metal, a Weight'disposed in Said' metal in said pot becomes low and the said pot and adapted toV be submerged in outer end of said lever is raised by said said metal, a lever pivoted Within said potJ weight.

and connected at one end to said Weight, In testimony whereof I affix my signature. v sadgpothaving an aperture through which Y said lever projects and an alarm device hav- Y VITUS A. BOKER. 

